mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
317 lines
17 KiB
C++
317 lines
17 KiB
C++
/*
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This file is part of solidity.
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solidity is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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solidity is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with solidity. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* @author Christian <c@ethdev.com>
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* @date 2014
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* AST visitor base class.
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*/
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#pragma once
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#include <libsolidity/ast/AST.h>
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#include <functional>
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#include <string>
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#include <vector>
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namespace dev
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{
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namespace solidity
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{
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/**
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* Visitor interface for the abstract syntax tree. This class is tightly bound to the
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* implementation of @ref ASTNode::accept and its overrides. After a call to
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* @ref ASTNode::accept, the function visit for the appropriate parameter is called and then
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* (if it returns true) this continues recursively for all child nodes in document order
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* (there is an exception for contracts). After all child nodes have been visited, endVisit is
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* called for the node.
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*/
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class ASTVisitor
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{
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public:
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virtual ~ASTVisitor() = default;
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virtual bool visit(SourceUnit& _node) { return visitNode(_node); }
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virtual bool visit(PragmaDirective& _node) { return visitNode(_node); }
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virtual bool visit(ImportDirective& _node) { return visitNode(_node); }
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virtual bool visit(ContractDefinition& _node) { return visitNode(_node); }
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virtual bool visit(InheritanceSpecifier& _node) { return visitNode(_node); }
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virtual bool visit(UsingForDirective& _node) { return visitNode(_node); }
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virtual bool visit(StructDefinition& _node) { return visitNode(_node); }
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virtual bool visit(EnumDefinition& _node) { return visitNode(_node); }
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virtual bool visit(EnumValue& _node) { return visitNode(_node); }
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virtual bool visit(ParameterList& _node) { return visitNode(_node); }
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virtual bool visit(FunctionDefinition& _node) { return visitNode(_node); }
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virtual bool visit(VariableDeclaration& _node) { return visitNode(_node); }
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virtual bool visit(ModifierDefinition& _node) { return visitNode(_node); }
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virtual bool visit(ModifierInvocation& _node) { return visitNode(_node); }
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virtual bool visit(EventDefinition& _node) { return visitNode(_node); }
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virtual bool visit(ElementaryTypeName& _node) { return visitNode(_node); }
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virtual bool visit(UserDefinedTypeName& _node) { return visitNode(_node); }
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virtual bool visit(FunctionTypeName& _node) { return visitNode(_node); }
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virtual bool visit(Mapping& _node) { return visitNode(_node); }
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virtual bool visit(ArrayTypeName& _node) { return visitNode(_node); }
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virtual bool visit(InlineAssembly& _node) { return visitNode(_node); }
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virtual bool visit(Block& _node) { return visitNode(_node); }
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virtual bool visit(PlaceholderStatement& _node) { return visitNode(_node); }
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virtual bool visit(IfStatement& _node) { return visitNode(_node); }
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virtual bool visit(WhileStatement& _node) { return visitNode(_node); }
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virtual bool visit(ForStatement& _node) { return visitNode(_node); }
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virtual bool visit(Continue& _node) { return visitNode(_node); }
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virtual bool visit(Break& _node) { return visitNode(_node); }
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virtual bool visit(Return& _node) { return visitNode(_node); }
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virtual bool visit(Throw& _node) { return visitNode(_node); }
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virtual bool visit(EmitStatement& _node) { return visitNode(_node); }
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virtual bool visit(VariableDeclarationStatement& _node) { return visitNode(_node); }
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virtual bool visit(ExpressionStatement& _node) { return visitNode(_node); }
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virtual bool visit(Conditional& _node) { return visitNode(_node); }
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virtual bool visit(Assignment& _node) { return visitNode(_node); }
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virtual bool visit(TupleExpression& _node) { return visitNode(_node); }
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virtual bool visit(UnaryOperation& _node) { return visitNode(_node); }
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virtual bool visit(BinaryOperation& _node) { return visitNode(_node); }
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virtual bool visit(FunctionCall& _node) { return visitNode(_node); }
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virtual bool visit(NewExpression& _node) { return visitNode(_node); }
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virtual bool visit(MemberAccess& _node) { return visitNode(_node); }
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virtual bool visit(IndexAccess& _node) { return visitNode(_node); }
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virtual bool visit(Identifier& _node) { return visitNode(_node); }
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virtual bool visit(ElementaryTypeNameExpression& _node) { return visitNode(_node); }
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virtual bool visit(Literal& _node) { return visitNode(_node); }
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virtual void endVisit(SourceUnit& _node) { endVisitNode(_node); }
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virtual void endVisit(PragmaDirective& _node) { endVisitNode(_node); }
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virtual void endVisit(ImportDirective& _node) { endVisitNode(_node); }
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virtual void endVisit(ContractDefinition& _node) { endVisitNode(_node); }
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virtual void endVisit(InheritanceSpecifier& _node) { endVisitNode(_node); }
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virtual void endVisit(UsingForDirective& _node) { endVisitNode(_node); }
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virtual void endVisit(StructDefinition& _node) { endVisitNode(_node); }
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virtual void endVisit(EnumDefinition& _node) { endVisitNode(_node); }
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virtual void endVisit(EnumValue& _node) { endVisitNode(_node); }
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virtual void endVisit(ParameterList& _node) { endVisitNode(_node); }
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virtual void endVisit(FunctionDefinition& _node) { endVisitNode(_node); }
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virtual void endVisit(VariableDeclaration& _node) { endVisitNode(_node); }
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virtual void endVisit(ModifierDefinition& _node) { endVisitNode(_node); }
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virtual void endVisit(ModifierInvocation& _node) { endVisitNode(_node); }
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virtual void endVisit(EventDefinition& _node) { endVisitNode(_node); }
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virtual void endVisit(ElementaryTypeName& _node) { endVisitNode(_node); }
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virtual void endVisit(UserDefinedTypeName& _node) { endVisitNode(_node); }
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virtual void endVisit(FunctionTypeName& _node) { endVisitNode(_node); }
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virtual void endVisit(Mapping& _node) { endVisitNode(_node); }
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virtual void endVisit(ArrayTypeName& _node) { endVisitNode(_node); }
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virtual void endVisit(InlineAssembly& _node) { endVisitNode(_node); }
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virtual void endVisit(Block& _node) { endVisitNode(_node); }
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virtual void endVisit(PlaceholderStatement& _node) { endVisitNode(_node); }
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virtual void endVisit(IfStatement& _node) { endVisitNode(_node); }
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virtual void endVisit(WhileStatement& _node) { endVisitNode(_node); }
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virtual void endVisit(ForStatement& _node) { endVisitNode(_node); }
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virtual void endVisit(Continue& _node) { endVisitNode(_node); }
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virtual void endVisit(Break& _node) { endVisitNode(_node); }
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virtual void endVisit(Return& _node) { endVisitNode(_node); }
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virtual void endVisit(Throw& _node) { endVisitNode(_node); }
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virtual void endVisit(EmitStatement& _node) { endVisitNode(_node); }
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virtual void endVisit(VariableDeclarationStatement& _node) { endVisitNode(_node); }
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virtual void endVisit(ExpressionStatement& _node) { endVisitNode(_node); }
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virtual void endVisit(Conditional& _node) { endVisitNode(_node); }
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virtual void endVisit(Assignment& _node) { endVisitNode(_node); }
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virtual void endVisit(TupleExpression& _node) { endVisitNode(_node); }
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virtual void endVisit(UnaryOperation& _node) { endVisitNode(_node); }
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virtual void endVisit(BinaryOperation& _node) { endVisitNode(_node); }
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virtual void endVisit(FunctionCall& _node) { endVisitNode(_node); }
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virtual void endVisit(NewExpression& _node) { endVisitNode(_node); }
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virtual void endVisit(MemberAccess& _node) { endVisitNode(_node); }
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virtual void endVisit(IndexAccess& _node) { endVisitNode(_node); }
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virtual void endVisit(Identifier& _node) { endVisitNode(_node); }
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virtual void endVisit(ElementaryTypeNameExpression& _node) { endVisitNode(_node); }
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virtual void endVisit(Literal& _node) { endVisitNode(_node); }
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protected:
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/// Generic function called by default for each node, to be overridden by derived classes
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/// if behaviour unspecific to a node type is desired.
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virtual bool visitNode(ASTNode&) { return true; }
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/// Generic function called by default for each node, to be overridden by derived classes
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/// if behaviour unspecific to a node type is desired.
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virtual void endVisitNode(ASTNode&) { }
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};
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class ASTConstVisitor
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{
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public:
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virtual ~ASTConstVisitor() = default;
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virtual bool visit(SourceUnit const& _node) { return visitNode(_node); }
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virtual bool visit(PragmaDirective const& _node) { return visitNode(_node); }
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virtual bool visit(ImportDirective const& _node) { return visitNode(_node); }
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virtual bool visit(ContractDefinition const& _node) { return visitNode(_node); }
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virtual bool visit(InheritanceSpecifier const& _node) { return visitNode(_node); }
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virtual bool visit(StructDefinition const& _node) { return visitNode(_node); }
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virtual bool visit(UsingForDirective const& _node) { return visitNode(_node); }
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virtual bool visit(EnumDefinition const& _node) { return visitNode(_node); }
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virtual bool visit(EnumValue const& _node) { return visitNode(_node); }
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virtual bool visit(ParameterList const& _node) { return visitNode(_node); }
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virtual bool visit(FunctionDefinition const& _node) { return visitNode(_node); }
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virtual bool visit(VariableDeclaration const& _node) { return visitNode(_node); }
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virtual bool visit(ModifierDefinition const& _node) { return visitNode(_node); }
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virtual bool visit(ModifierInvocation const& _node) { return visitNode(_node); }
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virtual bool visit(EventDefinition const& _node) { return visitNode(_node); }
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virtual bool visit(ElementaryTypeName const& _node) { return visitNode(_node); }
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virtual bool visit(UserDefinedTypeName const& _node) { return visitNode(_node); }
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virtual bool visit(FunctionTypeName const& _node) { return visitNode(_node); }
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virtual bool visit(Mapping const& _node) { return visitNode(_node); }
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virtual bool visit(ArrayTypeName const& _node) { return visitNode(_node); }
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virtual bool visit(Block const& _node) { return visitNode(_node); }
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virtual bool visit(PlaceholderStatement const& _node) { return visitNode(_node); }
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virtual bool visit(IfStatement const& _node) { return visitNode(_node); }
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virtual bool visit(WhileStatement const& _node) { return visitNode(_node); }
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virtual bool visit(ForStatement const& _node) { return visitNode(_node); }
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virtual bool visit(Continue const& _node) { return visitNode(_node); }
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virtual bool visit(InlineAssembly const& _node) { return visitNode(_node); }
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virtual bool visit(Break const& _node) { return visitNode(_node); }
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virtual bool visit(Return const& _node) { return visitNode(_node); }
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virtual bool visit(Throw const& _node) { return visitNode(_node); }
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virtual bool visit(EmitStatement const& _node) { return visitNode(_node); }
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virtual bool visit(VariableDeclarationStatement const& _node) { return visitNode(_node); }
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virtual bool visit(ExpressionStatement const& _node) { return visitNode(_node); }
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virtual bool visit(Conditional const& _node) { return visitNode(_node); }
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virtual bool visit(Assignment const& _node) { return visitNode(_node); }
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virtual bool visit(TupleExpression const& _node) { return visitNode(_node); }
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virtual bool visit(UnaryOperation const& _node) { return visitNode(_node); }
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virtual bool visit(BinaryOperation const& _node) { return visitNode(_node); }
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virtual bool visit(FunctionCall const& _node) { return visitNode(_node); }
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virtual bool visit(NewExpression const& _node) { return visitNode(_node); }
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virtual bool visit(MemberAccess const& _node) { return visitNode(_node); }
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virtual bool visit(IndexAccess const& _node) { return visitNode(_node); }
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virtual bool visit(Identifier const& _node) { return visitNode(_node); }
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virtual bool visit(ElementaryTypeNameExpression const& _node) { return visitNode(_node); }
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virtual bool visit(Literal const& _node) { return visitNode(_node); }
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virtual void endVisit(SourceUnit const& _node) { endVisitNode(_node); }
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virtual void endVisit(PragmaDirective const& _node) { endVisitNode(_node); }
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virtual void endVisit(ImportDirective const& _node) { endVisitNode(_node); }
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virtual void endVisit(ContractDefinition const& _node) { endVisitNode(_node); }
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virtual void endVisit(InheritanceSpecifier const& _node) { endVisitNode(_node); }
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virtual void endVisit(UsingForDirective const& _node) { endVisitNode(_node); }
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virtual void endVisit(StructDefinition const& _node) { endVisitNode(_node); }
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virtual void endVisit(EnumDefinition const& _node) { endVisitNode(_node); }
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virtual void endVisit(EnumValue const& _node) { endVisitNode(_node); }
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virtual void endVisit(ParameterList const& _node) { endVisitNode(_node); }
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virtual void endVisit(FunctionDefinition const& _node) { endVisitNode(_node); }
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virtual void endVisit(VariableDeclaration const& _node) { endVisitNode(_node); }
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virtual void endVisit(ModifierDefinition const& _node) { endVisitNode(_node); }
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virtual void endVisit(ModifierInvocation const& _node) { endVisitNode(_node); }
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virtual void endVisit(EventDefinition const& _node) { endVisitNode(_node); }
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virtual void endVisit(ElementaryTypeName const& _node) { endVisitNode(_node); }
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virtual void endVisit(UserDefinedTypeName const& _node) { endVisitNode(_node); }
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virtual void endVisit(FunctionTypeName const& _node) { endVisitNode(_node); }
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virtual void endVisit(Mapping const& _node) { endVisitNode(_node); }
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virtual void endVisit(ArrayTypeName const& _node) { endVisitNode(_node); }
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virtual void endVisit(Block const& _node) { endVisitNode(_node); }
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virtual void endVisit(PlaceholderStatement const& _node) { endVisitNode(_node); }
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virtual void endVisit(IfStatement const& _node) { endVisitNode(_node); }
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virtual void endVisit(WhileStatement const& _node) { endVisitNode(_node); }
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virtual void endVisit(ForStatement const& _node) { endVisitNode(_node); }
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virtual void endVisit(Continue const& _node) { endVisitNode(_node); }
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virtual void endVisit(InlineAssembly const& _node) { endVisitNode(_node); }
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virtual void endVisit(Break const& _node) { endVisitNode(_node); }
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virtual void endVisit(Return const& _node) { endVisitNode(_node); }
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virtual void endVisit(Throw const& _node) { endVisitNode(_node); }
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virtual void endVisit(EmitStatement const& _node) { endVisitNode(_node); }
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virtual void endVisit(VariableDeclarationStatement const& _node) { endVisitNode(_node); }
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virtual void endVisit(ExpressionStatement const& _node) { endVisitNode(_node); }
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virtual void endVisit(Conditional const& _node) { endVisitNode(_node); }
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virtual void endVisit(Assignment const& _node) { endVisitNode(_node); }
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virtual void endVisit(TupleExpression const& _node) { endVisitNode(_node); }
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virtual void endVisit(UnaryOperation const& _node) { endVisitNode(_node); }
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virtual void endVisit(BinaryOperation const& _node) { endVisitNode(_node); }
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virtual void endVisit(FunctionCall const& _node) { endVisitNode(_node); }
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virtual void endVisit(NewExpression const& _node) { endVisitNode(_node); }
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virtual void endVisit(MemberAccess const& _node) { endVisitNode(_node); }
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virtual void endVisit(IndexAccess const& _node) { endVisitNode(_node); }
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virtual void endVisit(Identifier const& _node) { endVisitNode(_node); }
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virtual void endVisit(ElementaryTypeNameExpression const& _node) { endVisitNode(_node); }
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virtual void endVisit(Literal const& _node) { endVisitNode(_node); }
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protected:
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/// Generic function called by default for each node, to be overridden by derived classes
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/// if behaviour unspecific to a node type is desired.
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virtual bool visitNode(ASTNode const&) { return true; }
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/// Generic function called by default for each node, to be overridden by derived classes
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/// if behaviour unspecific to a node type is desired.
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virtual void endVisitNode(ASTNode const&) { }
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};
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/**
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* Utility class that accepts std::functions and calls them for visitNode and endVisitNode.
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*/
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class SimpleASTVisitor: public ASTConstVisitor
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{
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public:
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SimpleASTVisitor(
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std::function<bool(ASTNode const&)> _onVisit,
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std::function<void(ASTNode const&)> _onEndVisit
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): m_onVisit(_onVisit), m_onEndVisit(_onEndVisit) {}
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protected:
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bool visitNode(ASTNode const& _n) override { return m_onVisit ? m_onVisit(_n) : true; }
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void endVisitNode(ASTNode const& _n) override { m_onEndVisit(_n); }
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private:
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std::function<bool(ASTNode const&)> m_onVisit;
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std::function<void(ASTNode const&)> m_onEndVisit;
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};
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/**
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* Utility class that visits the AST in depth-first order and calls a function on each node and each edge.
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* Child nodes are only visited if the node callback of the parent returns true.
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* The node callback of a parent is called before any edge or node callback involving the children.
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* The edge callbacks of all children are called before the edge callback of the parent.
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* This way, the node callback can be used as an initializing callback and the edge callbacks can be
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* used to compute a "reduce" function.
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*/
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class ASTReduce: public ASTConstVisitor
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{
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public:
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/**
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* Constructs a new ASTReduce object with the given callback functions.
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* @param _onNode called for each node, before its child edges and nodes, should return true to descend deeper
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* @param _onEdge called for each edge with (parent, child)
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*/
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ASTReduce(
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std::function<bool(ASTNode const&)> _onNode,
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std::function<void(ASTNode const&, ASTNode const&)> _onEdge
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): m_onNode(_onNode), m_onEdge(_onEdge)
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{
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}
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protected:
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bool visitNode(ASTNode const& _node) override
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{
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m_parents.push_back(&_node);
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return m_onNode(_node);
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}
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void endVisitNode(ASTNode const& _node) override
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{
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m_parents.pop_back();
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if (!m_parents.empty())
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m_onEdge(*m_parents.back(), _node);
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}
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private:
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std::vector<ASTNode const*> m_parents;
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std::function<bool(ASTNode const&)> m_onNode;
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std::function<void(ASTNode const&, ASTNode const&)> m_onEdge;
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};
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}
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}
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